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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '812d29e0862b8540c911101f798c2ea48d25019a6da37b0a9310b860c1a214c3' 
  AND token = 'Mf0Lv2L5iz9zhjCIPFGaq/RvinKxy5HuSrQQtOFumz4=' 
  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"
    }
  }
}