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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e9db0517f004d6897c1e27c7f278596daade346e5602114cc00e3cd0482080d' 
  AND token = 'fwyAc+oLCc7ILz3jIpA2mIyR0mdyEdwRkcqFi2a4zEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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