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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9070405b6c02ec974ec006243b39ca60a60617c6a2f0fd2ea9b99e6eb62f2dea' 
  AND token = '3+oAf40BbzUKfbhh+RuxpJySN9dHqtVlltZn2Dj44sg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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