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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db63037f5e59947f4ef7f146703ea2033210d36d72a00856d89f76f228b7ba6e' 
  AND token = 'iHwM/mFg8Ttexh3SntyYPJao7JopAA8KUmocSNs2NCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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