SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d1dd6bc56dfe0ab50b074a0b98fb3e2d6ca6920877561f3c45d483fda93bae6' 
  AND token = 'Lpr2dNvc6XXuddI/FsRcU2HxqWA+ttUEM/oDX+eyOmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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