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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7eaf81c142fabcb514e8c78e6a7b3dbdb97bcd7d0c24c81de48c607cb42f93e6' 
  AND token = '8B5m6jg5Ha26fEYieEoLom70RyNU4LlaB704cszJHoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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