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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42f35e38aa802c498b4281d16cc7abbb1c579d94229c8f807427a873479b2911' 
  AND token = 'Bu4cX7TMcqOpQ89YD/mfO+fRbXHgp6EjGx/B+c5k9bo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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