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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6719e4a6565efdd4df7f755efc45d0fb4f18804920f78f975f0352c0fa7f9e94' 
  AND token = 'zJ049QwutXC3ZvPPlFYrAkzAeNC1V2GGkxGTYzmwqfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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