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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a6f3ed222f14d4850bcd75623d4b5c344ae5341eb7955a8d87a2ff66358a004' 
  AND token = 'HLmNFpJfnXG1dG8j39nrsT0IuJZf2G5ETFPi7G350e0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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