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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c815ffab57152ff9d45da3515e21f77a4b95e328fa981ac410f1e94e5c47bbff' 
  AND token = 'eJmImo2XMipEYLPHPYkw+S525QrFi8ouBzNZJB5tE98=' 
  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"
    }
  }
}