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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd4cff97512624161d3a44d891f7fb1c3c178e8c3fd283faf4d711071ce63086' 
  AND token = 'LLk/b9v3BMblWvR/OhDSds3/gwYTh71XWxY/CnxaNT0=' 
  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"
    }
  }
}