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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c1806ebf6609b07c85fa5fbd020c67a81ef1965ab4be0af8179f52c1beca412' 
  AND token = 'ABigCazwdUbKLGcPy3p6MUWAMIv8tl/Le71UwL91Tvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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