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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c269dcdca405ed769efda9b69bb6a2287491d305c581e22869ad9b396c6a0300' 
  AND token = 'Sj4v8b9S2H4Q1e/+468xM3e/JAqmzw3/NjUWq6ifRmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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