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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '783fa1a781e7e0cc89f12e5fc381e4687eb30412139a0a16121a82fd37ec2ac4' 
  AND token = 'XL/jdC51s6cdyY0x6StL+E6upEaedOuGlSf/yIIp2DQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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