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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ea9a4342741a6b388eb935cfa1ba37ab370b8faa99128d984b5ef9da827b782' 
  AND token = 'l814n6mIROqH4GCOfe8odWkIUwW6KKNN8/mfEqFDhcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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