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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '198906bdcf4ab3b933fa1464f4de617fb7a93c11e22cc41d30920edac06fa5e5' 
  AND token = 'YTzk3yW0YAWlfK2r27pdR+FXb0vyyzciisXnd53G5WY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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