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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f37048a8537b4afa2ad6d251cfe60194c3577517906f338ca42f694e5d7b3e9c' 
  AND token = 'VO5hCtQR92FG4Jn08ehPKji5Rt9fWsDb3v5Wa1bvPXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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