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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f52fef3199345c4e8a418ee03f6ce4816340dc7b928171073c59678f2a30ea4d' 
  AND token = 'ZYnqj5yUJ/rsFaHYgNWN7NJNsJkonzEn3wp97812VoM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}