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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ee522a1da4bc735a26696fc7bee523c1370e7d229af060953b5c9ecfc652ffc' 
  AND token = 'ge0hJ9sp60ujyXzSVV7z67UiWlvJQrt1i8luru5nu28=' 
  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"
    }
  }
}