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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a90a45b442a237dfe75d5ca1096d98495b73b79f49f043ae3b9f641fb8410969' 
  AND token = 'LSecyb6zv9eUi81Mvz+c3ky/+9B9Bcy5d23ErtvLCtQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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