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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c29e677323d716888686c9ded7921bf3c526cd5fdb8ea3d217be3ba42d8527f2' 
  AND token = 'zPPRftsE9FdVbPjvMyX7l7jaGUVVYud3EsvCPLydVZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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