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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '546390065564630f7e7214c50860c92445bf1ae22fcd15113b24eac39dea1167' 
  AND token = 'PuF3aHNZnnexPZs4/A2Wo1ru3oje7wSPk3MDBNUN8bQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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