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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8eeeb8778a6a1ff1e0aada96a8ba6c215abfe83e813a7de2aed53fddc8600370' 
  AND token = 'Z+j5kjpH07oiONW8Ozp4HkMS0RyEghJpPRRHE+BMcxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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