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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3186cf5ca107a46dba8d618bb49ecd45eaaa639e47cdb3333923582ba04ece58' 
  AND token = 'aDV/LrhfD7U4C2zRQkec7tI8TLNZRXAjuC6hKHl9Ds8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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