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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85ed8de5b61fec18ca535f678b37e81122300ee5a5f9e0dc8f874ae2e731b2bc' 
  AND token = 'Pr5dpRsfYDCLnYRZVIbv5ljan12wj1l0ifbRkqBtzc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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