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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ced10145bfa830b909f3d6af445d9e12c29a81e9f51b4c2f02fe8a55d52467c' 
  AND token = '6EhUD8JX3jiqe31gjc5aJa2boLW8+yAu0N+v5S7E09I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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