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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '750e5c9ebf8e951968445af421414912591778443f05462f8cc264bb31660331' 
  AND token = '+ez+0vMO6CcPYodNrTtyF256HkMpKMv5qNXh+Sogts0=' 
  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"
    }
  }
}