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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ce3dd6465dfbbcecc7130d64e47a8914bd95d10d37167a2804e8da1e16711a3' 
  AND token = 'NkC70h0oSwaJKDNYABOHdNe4kfH3AW+57EzNDGf6w0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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