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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3100b9a5ea2054bcac1be443916c68ba46561b6b4cd56ec2216aa4292f52bf64' 
  AND token = 'AAwqkh/eOZqu9H5QKjtsNFlrzWeZtF8FJmFbDwjd7Yw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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