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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29e370d6954f97e29ce6ac1f7e3248fc6662cff17e6e1d9c2e05c54d6ed0b040' 
  AND token = '1/K8EP/EuIZKIwdZum5iWVw5QG+kmM83Q/DUDvq+Reo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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