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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '381f39e19dae1b26acbfac64f362c0c267e5df8882d1428cb2421380ddc3cee8' 
  AND token = '/l02VvFcISQcyOzMnd7TWm5uYTDc67dOKNdrzlUxjNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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