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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21087046d5e084a4d65274a5aba135ec0a3d4ad93e0a0e39916149bb85df1499' 
  AND token = '0Z30avukMgXAaB4/8xbCgY0VNDfGwjyEvkTFqVfnx9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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