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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d50f883b5ec85fb0e0b0d95ffdd053b0764ae133d3e64b746a64fdcd54968fa' 
  AND token = 'scBPM6528Cia8CAhB6YbVN/da3eEnZSivOCgre23S8I=' 
  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"
    }
  }
}