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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02ef4e6e2922a81786797ec077b9d1a1a09fc80667cd24da46b1f7c7ef85e528' 
  AND token = 's+hlsJV4zYB8l4Yb7on7znNmAJ/6/SfVhOJG1FXwFrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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