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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65ba00460670293f0762c54a748cc68d46cd364f7a1ad3d755835d610f5191d6' 
  AND token = 'Bjfqsr7hGTb5V4CQC6HYD0euPnyHfCuJTBV1hzUH1Gg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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