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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24a3b94f06703af8a90dc163af9204ec9f802c2b1a7057d27d6a379482ad1f0c' 
  AND token = 'yYNdVsLYGnVwOB0hD0MX0X0P2om2rzBZlPrcGDbT61M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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