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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '310d674ffd0485fe69ea5d9ed0306be63f66c5b5b37d9fe66ca568a7753727f7' 
  AND token = 'yZ6eOMouNZKVTGESO+zQ6ZXS/47onQagoawA6hlNQuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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