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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c842c2cf29c3c931c18c91adfd866bc7e3393868c2aeb1b8b811c86dac780b43' 
  AND token = 'gOsL427uC4p08OmcFT29dyxyAK7n+igCip50eliHaEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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