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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b3fd83272f1cda3c2721568cb8ad048064d162ca3f7b99661fb5eb8ceb9bcc5' 
  AND token = 'OMboCMz5UCsYpC8H6TJkTX9YeWcb7BLueO5Fld43eaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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