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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b230a61bf6034cb6d70b6dae46655647d605c91ecd6e5779c7516f05a2bcd3e5' 
  AND token = '/9EAq9E8K3uK5GfNC5LkXGM0wYQAYlRvr9lz+VRW//U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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