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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6abac9d0ea8f173cb9af0a9becbfe5f3d04fb9f072d00fefc1924a678df2baa2' 
  AND token = 'EzjAzJdpXzE4GWZxM0lp7SWn0HrlpteYaPRAX48YA1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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