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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '077f6f42644e5649d6df6d0fcad2b49648128e42505987a510f313dfdd7d6017' 
  AND token = '/2TF91QmR9c2mslJrwsshlffPqqt8KnwjJFfMgcG30c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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