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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c7cf66b530bbc130cdf5ba3dfbf712815612cb112d98b45d1d6e5ab05160194' 
  AND token = 'ECRG1EmKOU/aiScwhxQDXz1neVU58JieXRSuvUT3S7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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