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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e73138674813d0f0595dbe2cb03ee5d17b2f2907f3e09717fad3b6bf288fd683' 
  AND token = 's155fofPrYS5+AylQbWgAtQzPc3V9+4b0xO3Kps5lw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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