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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3348a0c276d20625bda8b0fb7ad07a4821c233a9a848f66a0195bfa38422f38d' 
  AND token = 'RFzczhtV6aglqY1H85CIqJEpdkijc4lMD2QoyIR+/0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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