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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '334da0f4de0636c78995f956d4e459b7d972f5eacb7cdd79723fe3db17b7f8b9' 
  AND token = 'sqSjTXq247M58tYG5Scz70PjN/O7b6C80vE7HRm4aH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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