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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99d5d52b3811da9dfdf3bb0957ee3de31ffdbb6427712beeef7d878fc6361a70' 
  AND token = '3X1rRc0rBCo7VIs2Cv6Uae4nFdwwygIVHlmzU9fmLmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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