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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0faa2c0c9e7609ccd587dba7402624242bfaada96e04274a9ebd60ea30f2e277' 
  AND token = 'jp2cqAsmZLz39IOQdj/gcE8ozNI0Q9AO6BGeWoTtRRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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