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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c16fbe260ff0f5dfb3095d368bdebda70df76da1a19721999b21c4e3c64ca46e' 
  AND token = 'w6vcatqFSNggJOqkmbdBG8TopNA2bngCKVw46YtdG98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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