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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea3b83b66171d2ed952f6deb19d80086ee30ab4a5a8daaa26e7de7ea654b3847' 
  AND token = 'HiF8LU8SyqAaD08DISLrI4E3Acyh8TBSb7LbeNiqR30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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