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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7068c753fa17294a5cf87e0a66c3238ff54325b72cd136e1d642298fd1f5def0' 
  AND token = 'obzFypLpLGzitC/G6qKOsA3vl0gcR4EVTL1I17LbiIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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