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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e3a33e95c1507cae7edcb7b99dcf36dd1eb11c0da14bf8997b86eb1522558e3' 
  AND token = '/G2WVhh14iUIccEc2cI04hrdBr+8khfXOOfBxYLzUwQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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