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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7d853d9b53af5c7e8dd26de38859ba503e085191cec88430548e3642e2dd8fe' 
  AND token = 'XgDIMccl0pjlrSd4T4/rGd1S+GzLYqsrZ1+jUHksoLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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