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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3af7c51df53afc5c41e06679c928e7cb4ec28a1cc915331bd4b6e2a5a30ef351' 
  AND token = 'pudJEHUoSssvt+KNVWZvR5G4lk47f2CFjhE9Q9rRLeU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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