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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b9b0361b0ee62cb79e8fc69317576e847dfff3fd6e95d8d8d02764a0204f9fe' 
  AND token = 'XYdea22tCy4ZQ8c32x3UQZtDzt3WIxrsdUKKMWZTu04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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