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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0b3150f2ab4091287d5a9bf8ce67451df4237b9db214c98e67a80221c65bde0' 
  AND token = 'axT5I0kG+LhDm39lj87ZtbYu1cXXWDPE0xooVfZB7QA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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