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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f434fd820e37bb94eb6b35ee23afc16d20c8c7f9d6893fdda5f93de4d58141fb' 
  AND token = 'oH/CTyzWo+wMK64wV4o/MFBA+Y+aN9HCPss8UX7s4j0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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