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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ca56910118b833a68d21a932f8778cfb742d03f6a8f2cf63b8220d7171d3d62' 
  AND token = '5qx52BbZFt1qY79wvpQbv4sXaCdXureGQswTFD8m3UI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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