SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f691fcc81065c928a1209571db3ac0bcb8501e57b9e9bc4ad9696857714a8bf' 
  AND token = 'rrDV9GIjdv4B/CbVghNk/wJrJHZA2m0GY7KDAvH44f4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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