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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c3d07546a51a1866110f8afb6a826c75797478040807f0481d6d5099b3c8032' 
  AND token = 'WwExfV3GpAvXWymOZn3dwGufCOWxE7dBG/3jh8rr7QA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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