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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2adfb0a5d2e5863e8c103c0fbf7117d53444d80e64e640e73696b2859c790dc' 
  AND token = 'CqEaTlbg+Y3E5hJJfbwEoDr9uwZua94Q5S9rYVk9IGc=' 
  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"
    }
  }
}