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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35308533d465f8a6301c362a961c7a072a89f497b4003bc3b35064f297b074ab' 
  AND token = 'TMFZdTli7pOn6XUGxuxP49vHl6b2vfQmPF/xBoEakEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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