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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64f21f6b0d7c619a4c3c3ee6cc1c5b4b494bd5e00f14466d0ff230aa08c7a1b0' 
  AND token = 'MqPDsD5DOhrRSJo2E5H8MCZ9cb7I7E4csXgP893hEuk=' 
  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"
    }
  }
}