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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79d805ad0a297ef3fbe1c4d41689f9fbaa0ae75f8fd216a3695cedc69c11fbce' 
  AND token = 'clviqeex3q4V1AyxCawnCwCRAKgpPJHS7hUc8OtaJHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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